vikens856 vikens856

15-10-2017
Mathematics

contestada

Sample of 3 items is selected at random from a box containing 20 items of which 4 aredefective. find the expected number of defective items in the sample.

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RubyMac RubyMac

15-10-2017

That's 54 I think. 20x3=60-4=54

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